str="day day up"
for i in range(len(str)):
    print(str[i],end=" ")

list1=[]
# list1[0]=1
# list1[1]=2
list1.append(3)
list1.append(4)
print(list1)

list3=list();
list3.append(1)
list3.append(2)
print(list3)

list2=[1,2,3]
for i in list2:
    print(i)
list2.insert(1,10)
print(list2)
list2.extend([11,12])
print(list2)
list2.sort()
print(list2)

list3=sorted(list2)
print(list3)
del list3
print('----------')


list4=[1,3,5,7,9]
list5=[i**2 for i in range(1,10) if i%2!=0]
print(list5)

str=('111',) # 一个字符串要加,表示元组
print(type(str))

